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= a(a+b) + b(a+b)
= a²+ab+ab+b²
= a²+2ab+b²
b. (a-b)² = (a-b)(a-b)
= a(a-b) - b(a-b)
= a²-ab-ab+b²
= a²-2ab+b²
c. (ax+b)(cx+d) = ax(cx+d) + b(cx+d)
= acx²+adx+bcx+bd
***maaf klo salah***