
Concept explainers
To calculate: The factors of the polynomial −12x2+8x+15 .

Answer to Problem 4DGP
The factors of the polynomial −12x2+8x+15 are −6x−5 and 2x−3 .
Explanation of Solution
Given information:
The expression −12x2+8x+15 .
Formula used:
To find the factor of the trinomial of the form ax2+bx+c , find the numbers p,q,r and s such that sum of product of two numbers is equal to coefficient of x(ps+qr=b) , product of p and q is equal to the coefficient of x2pq=a and product of r and s numbers is equal to constant term (r⋅s=c) , such that (px+r) and (qx+s) are the factors of ax2+bx+c .
ax2+bx+c=pqx2+(ps+qr)x+rs=pqx2+psx+qrx+rs=px(qx+s)+r(qx+s)=(px+r)(qx+s)
Calculation:
Consider the given expression −12x2+8x+15 .
Recall that to find the factor of the trinomial of the form ax2+bx+c , find the numbers p,q,r and s such that sum of product of two numbers is equal to coefficient of x(ps+qr=b) , product of p and q is equal to the coefficient of x2(pq=a) and product of r and s numbers is equal to constant term (r⋅s=c) , such that (px+r) and (qx+s) are the factors of ax2+bx+c .
ax2+bx+c=pqx2+(ps+qr)x+rs=pqx2+psx+qrx+rs=px(qx+s)+r(qx+s)=(px+r)(qx+s)
So, find p,q,r and s such that pq=−12 , ps+qr=8 and rs=15 .
So, −12x2+8x+15 will be factorized as,
−12x2+8x+15=−12x2+18x−10x+15=−6x(2x−3)−5(2x−3)=(−6x−5)(2x−3)
Thus, the factors of polynomial −12x2+8x+15 are −6x−5 and 2x−3 .
Chapter 4 Solutions
Glencoe Algebra 2 Student Edition C2014
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