Question

(7x+6)(9x-2) use identity in this question

Answer 1

Answer:

63x2 + 40x - 12

is the correct answer

Answer 2

Answer:

IDENTITY : (a+b)(c+d) = a(c+d)+b(c+d) = (ac + ad) + (bc+bd)

(7x+6)(9x-2) = 7x(9x-2)+6(9x-2)

= [7x×9x + 7x×(-2)] + [6×9x + 6(-2)]

= 63x^2 + (-14)x + 54x + (-12)

= 63x^2 + 40x - 12