Question

(2x+3)(x-5)+7=ax2+bx+c The value Of ABC

Answer 1

$LHS = (2x+3)(x-5)+7$

$= 2x(x-5)+3(x-5) + 7$

$= 2x^{2} - 10x + 3x - 15 + 7$

$= \blue {2x^{2} - 7x - 8}$

$=\pink{ ax^{2} + bx + c }$

/* Compare */

$a = 2 , b= -7 \: and \: c = -8$

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