factorise 36(a + 2b)^2 - 49(2a - b)^2 using isentities
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Answer:
19b^2 - 4a( 8a - 17b )
Step-by-step explanation:
0 = 36[a^2 + 4b^2 + 4ab] - 49[ 4a^2 + b^2 - 4ab]
0 = 36a^2 + 144b^2 + 144ab - 196a^2 - 49b^2 + 196ab
0 = -160a^2 + 95b^2 + 340ab
0 = 5[ -32a^2 + 19b^2 + 68ab]
0/5 = 19b^2 - 32a^2 + 68ab
0 = 19b^2 - 4a( 8a - 17b )
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