Question

answer this question part 6​

Answer 1

Answer:

$20x {}^{2} - 45 = 5(4x {}^{2} - 9)$

$5(4x {}^{2} - 9) = 5(2x + 3)(2x - 3)$

because

$a {}^{2} - b {}^{2} =( a + b)(a - b)$

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