answer 14 and 15...............
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Šůđhăñśhű08:
hiii
hi
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14,
first,
8(2+1)^2 +2(a+1) (b+2)-5(b+2)^2
(a+b)^2 =a^2 +2ab+b^2
1st, 2^2+1^2+2×1×2
=4+1+4
=8 ×9
=72
2nd. (a+1) (b+2)
= a(b+2)+1(b+2)
=ab+2a+b+2
=2×ab+2a+b+2
=2ab +4a+2b+4
3rd,
-5(b+2)^2
=b^2+2^2+2×2×b
=b^2+4+4b
- 5(b^2+4+4b)
=-5b^2 -20-20 b
=72 +2ab +4a+2b+4-5b^2-20-20b^2
(72+4-20) +(2b-5b)+4a-20b^2
=56+-3b+4a-20b^2
first,
8(2+1)^2 +2(a+1) (b+2)-5(b+2)^2
(a+b)^2 =a^2 +2ab+b^2
1st, 2^2+1^2+2×1×2
=4+1+4
=8 ×9
=72
2nd. (a+1) (b+2)
= a(b+2)+1(b+2)
=ab+2a+b+2
=2×ab+2a+b+2
=2ab +4a+2b+4
3rd,
-5(b+2)^2
=b^2+2^2+2×2×b
=b^2+4+4b
- 5(b^2+4+4b)
=-5b^2 -20-20 b
=72 +2ab +4a+2b+4-5b^2-20-20b^2
(72+4-20) +(2b-5b)+4a-20b^2
=56+-3b+4a-20b^2
answer is wrong
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