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Use the long division method to find the result when 
4x^(3)+7x^(2)-11 x-5 is divided by 
4x-5. If there is a remainder, express the result in the form 
q(x)+(r(x))/(b(x)).

Use the long division method to find the result when 4x3+7x211x5 4 x^{3}+7 x^{2}-11 x-5 is divided by 4x5 4 x-5 . If there is a remainder, express the result in the form q(x)+r(x)b(x) q(x)+\frac{r(x)}{b(x)} .

Full solution

Q. Use the long division method to find the result when 4x3+7x211x5 4 x^{3}+7 x^{2}-11 x-5 is divided by 4x5 4 x-5 . If there is a remainder, express the result in the form q(x)+r(x)b(x) q(x)+\frac{r(x)}{b(x)} .
  1. Set up division: Set up the long division by writing 4x3+7x211x54x^3 + 7x^2 - 11x - 5 under the long division symbol and 4x54x - 5 outside.
  2. Find first quotient term: Divide the first term of the dividend, 4x34x^3, by the first term of the divisor, 4x4x, to get the first term of the quotient, x2x^2.\newlineCalculation: 4x3÷4x=x24x^3 \div 4x = x^2
  3. Multiply and subtract: Multiply the entire divisor 4x54x - 5 by the first term of the quotient x2x^2 and write the result under the dividend.\newlineCalculation: x2(4x5)=4x35x2x^2 \cdot (4x - 5) = 4x^3 - 5x^2
  4. Bring down next term: Subtract the result of the multiplication from the dividend to find the new dividend.\newlineCalculation: (4x3+7x2)(4x35x2)=7x2(5x2)=7x2+5x2=12x2(4x^3 + 7x^2) - (4x^3 - 5x^2) = 7x^2 - (-5x^2) = 7x^2 + 5x^2 = 12x^2
  5. Find next quotient term: Bring down the next term of the original dividend, which is 11x-11x, to get 12x211x12x^2 - 11x.
  6. Multiply and subtract: Divide the first term of the new dividend, 12x212x^2, by the first term of the divisor, 4x4x, to get the next term of the quotient, 3x3x.\newlineCalculation: 12x2÷4x=3x12x^2 \div 4x = 3x
  7. Bring down next term: Multiply the entire divisor 4x54x - 5 by the new term of the quotient 3x3x and write the result under the new dividend.\newlineCalculation: 3x(4x5)=12x215x3x \cdot (4x - 5) = 12x^2 - 15x
  8. Find final quotient term: Subtract the result of the multiplication from the new dividend to find the next new dividend.\newlineCalculation: (12x211x)(12x215x)=12x212x211x+15x=4x(12x^2 - 11x) - (12x^2 - 15x) = 12x^2 - 12x^2 - 11x + 15x = 4x
  9. Multiply and subtract: Bring down the next term of the original dividend, which is 5-5, to get 4x54x - 5.
  10. Check for remainder: Divide the first term of the next new dividend, 4x4x, by the first term of the divisor, 4x4x, to get the next term of the quotient, 11.\newlineCalculation: 4x÷4x=14x \div 4x = 1
  11. Check for remainder: Divide the first term of the next new dividend, 4x4x, by the first term of the divisor, 4x4x, to get the next term of the quotient, 11.\newlineCalculation: 4x÷4x=14x \div 4x = 1Multiply the entire divisor 4x54x - 5 by the new term of the quotient 11 and write the result under the next new dividend.\newlineCalculation: 1(4x5)=4x51 \cdot (4x - 5) = 4x - 5
  12. Check for remainder: Divide the first term of the next new dividend, 4x4x, by the first term of the divisor, 4x4x, to get the next term of the quotient, 11.\newlineCalculation: 4x÷4x=14x \div 4x = 1Multiply the entire divisor 4x54x - 5 by the new term of the quotient 11 and write the result under the next new dividend.\newlineCalculation: 1(4x5)=4x51 \cdot (4x - 5) = 4x - 5Subtract the result of the multiplication from the next new dividend to find the remainder.\newlineCalculation: (4x5)(4x5)=4x4x5+5=0(4x - 5) - (4x - 5) = 4x - 4x - 5 + 5 = 0
  13. Check for remainder: Divide the first term of the next new dividend, 4x4x, by the first term of the divisor, 4x4x, to get the next term of the quotient, 11.\newlineCalculation: 4x÷4x=14x \div 4x = 1Multiply the entire divisor 4x54x - 5 by the new term of the quotient 11 and write the result under the next new dividend.\newlineCalculation: 1(4x5)=4x51 \cdot (4x - 5) = 4x - 5Subtract the result of the multiplication from the next new dividend to find the remainder.\newlineCalculation: (4x5)(4x5)=4x4x5+5=0(4x - 5) - (4x - 5) = 4x - 4x - 5 + 5 = 0Since the remainder is 00, the division is exact and there is no remainder term to include in the final answer.