please answer question number 13
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TO FIND;9x^2 + 16y^2
SOLUTION:9x^2 + 16y^2= (3x)^2 + (4y)^2
FORMULA;a^2+b^2=(a-b)^2 + 2ab
(3x)^2 + (4y)^2= (3x-4y)^2 + 2(3x)(4y)
=(3x-4y)^2+24xy
=(10)^2 + 24(-1)
=100-24
(3x-4y)^2=76