(9x^2+42x+49)^2_y^4 factorise
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[(3x)² + 2×3x×7 +(7)²] ²-y⁴
[(3x+7)²] ²-(y²) ²
{(3x+7)²+y²} { (3x+7)²-y²}
(9x²+42x+49+y²) (3x+7-y) (3x+7+y)
[(3x+7)²] ²-(y²) ²
{(3x+7)²+y²} { (3x+7)²-y²}
(9x²+42x+49+y²) (3x+7-y) (3x+7+y)
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