Use the long division method to find the result when 4x3+7x2−11x−5 is divided by 4x−5. If there is a remainder, express the result in the form q(x)+b(x)r(x).
Q. Use the long division method to find the result when 4x3+7x2−11x−5 is divided by 4x−5. If there is a remainder, express the result in the form q(x)+b(x)r(x).
Set up division: Set up the long division by writing 4x3+7x2−11x−5 under the long division symbol and 4x−5 outside.
Find first quotient term: Divide the first term of the dividend, 4x3, by the first term of the divisor, 4x, to get the first term of the quotient, x2.Calculation: 4x3÷4x=x2
Multiply and subtract: Multiply the entire divisor 4x−5 by the first term of the quotient x2 and write the result under the dividend.Calculation: x2⋅(4x−5)=4x3−5x2
Bring down next term: Subtract the result of the multiplication from the dividend to find the new dividend.Calculation: (4x3+7x2)−(4x3−5x2)=7x2−(−5x2)=7x2+5x2=12x2
Find next quotient term: Bring down the next term of the original dividend, which is −11x, to get 12x2−11x.
Multiply and subtract: Divide the first term of the new dividend, 12x2, by the first term of the divisor, 4x, to get the next term of the quotient, 3x.Calculation: 12x2÷4x=3x
Bring down next term: Multiply the entire divisor 4x−5 by the new term of the quotient 3x and write the result under the new dividend.Calculation: 3x⋅(4x−5)=12x2−15x
Find final quotient term: Subtract the result of the multiplication from the new dividend to find the next new dividend.Calculation: (12x2−11x)−(12x2−15x)=12x2−12x2−11x+15x=4x
Multiply and subtract: Bring down the next term of the original dividend, which is −5, to get 4x−5.
Check for remainder: Divide the first term of the next new dividend, 4x, by the first term of the divisor, 4x, to get the next term of the quotient, 1.Calculation: 4x÷4x=1
Check for remainder: Divide the first term of the next new dividend, 4x, by the first term of the divisor, 4x, to get the next term of the quotient, 1.Calculation: 4x÷4x=1Multiply the entire divisor 4x−5 by the new term of the quotient 1 and write the result under the next new dividend.Calculation: 1⋅(4x−5)=4x−5
Check for remainder: Divide the first term of the next new dividend, 4x, by the first term of the divisor, 4x, to get the next term of the quotient, 1.Calculation: 4x÷4x=1Multiply the entire divisor 4x−5 by the new term of the quotient 1 and write the result under the next new dividend.Calculation: 1⋅(4x−5)=4x−5Subtract the result of the multiplication from the next new dividend to find the remainder.Calculation: (4x−5)−(4x−5)=4x−4x−5+5=0
Check for remainder: Divide the first term of the next new dividend, 4x, by the first term of the divisor, 4x, to get the next term of the quotient, 1.Calculation: 4x÷4x=1Multiply the entire divisor 4x−5 by the new term of the quotient 1 and write the result under the next new dividend.Calculation: 1⋅(4x−5)=4x−5Subtract the result of the multiplication from the next new dividend to find the remainder.Calculation: (4x−5)−(4x−5)=4x−4x−5+5=0Since the remainder is 0, the division is exact and there is no remainder term to include in the final answer.
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