Question

Find the product of (8x-9) and (2x-4y).Also find the value of the product when x=4.​

Answer 1

Answer:

$= (8x - 9)(2x - 4y) \\ \\ = 8x(2x - 4y) - 9(2x - 4y) \\ \\ = {16x}^{2} - 32xy - 18x + 36y \\ \\ value \: \: \: of \: \: \: the \: \: \: product \: \: \: when \: \: \: x \: \: \: \: = \: \: \: \: 4 \\ \\ = 16 \times {4}^{2} - 32 \times 4 \times y - 18 \times 4 + 36y \\ \\ = 16 \times 16 - 128y - 72 + 36y \\ \\ = 256 - 128y - 72 + 36y \\ \\ - 128y + 36y + 256 - 72 \\ \\ =128y + 36y + 256 - 72 \\ \\ = 164y + 184$

Answer 2

Answer:

Please refer below

Step-by-step explanation:

2x-4y

8x-9

16x^2-32xy

           -18x+36y

16x^2-32xy-18x+36y

x=4

16(4^2)-32(4)(y)-18(4)+36y

16(16)-128y-72+36y

256-128y-72+36y