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Paul [167]
2 years ago
9

Someone help plz? Will mark brainiest!

Mathematics
1 answer:
Alex2 years ago
4 0
2. (a+b)²=a²+2ab+b²
(5x-2)²=(5x)²-2×5x×2+2²
(5x-2)²=25x²-20x+4

4. (a+b)²=a²+2ab+b²
(2x+5)²=(2x)²+2×2x×5+5²
(2x+5)²=4x²+20x+25
∵a=4, b=20, c=25
∴a+b+c=4+20+25=49

Hope my answer helped u :)
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