Use Polynomial Long Division: To divide the polynomial x4+8x3−10x2−48x−17 by the binomial x2−6, we will use polynomial long division.
Divide Leading Terms: First, we divide the leading term of the dividend, x4, by the leading term of the divisor, x2, to get x2. This will be the first term of our quotient.
Subtract Result: Next, we multiply the entire divisor x2−6 by x2 and subtract the result from the dividend.x2⋅(x2−6)=x4−6x2.Subtracting this from the dividend gives us:(x4+8x3−10x2)−(x4−6x2)=8x3+4x2−48x−17.
Divide New Leading Term: Now, we divide the leading term of the new dividend, 8x3, by the leading term of the divisor, x2, to get 8x. This will be the next term of our quotient.
Subtract Result Again: We multiply the entire divisor x2−6 by 8x and subtract the result from the new dividend.8x⋅(x2−6)=8x3−48x.Subtracting this from the new dividend gives us:(8x3+4x2−48x)−(8x3−48x)=4x2−17.
Divide Remaining Term: Finally, we divide the leading term of the remaining dividend, 4x2, by the leading term of the divisor, x2, to get 4. This will be the last term of our quotient.
Subtract Final Result: We multiply the entire divisor x2−6 by 4 and subtract the result from the remaining dividend.4⋅(x2−6)=4x2−24.Subtracting this from the remaining dividend gives us:(4x2−17)−(4x2−24)=7.
Determine Quotient and Remainder: The remainder is 7, which cannot be divided further by x2−6 since it is of lower degree. Therefore, the quotient is x2+8x+4 with a remainder of 7.
More problems from Divide polynomials using long division