Question

A)(x+7)²
B)(5+2ma)².
C)(a+3x)²
D)(10x+y)²

Answer 1

a)

= (x + 7)² 

= x² + 2.7x + 7² 

= x² + 14x + 49
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b)
= (5 + 2ma)² 

= 5² + 2.5.2ma + (2ma)²
 
= 25 + 20 ma + 4 m²a²
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c)
= (a + 3x)²

= a² + 2.a.3x + (3x)²

= a² + 6ax + 9x² 
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d)
= (10x+y)²

= (10x)² + 2.10x.y + y²

= 100x² + 20xy + y²

Answer 2

Ola 

(x + 7)² = x² + 14x + 49

(5 + 2ma)² = 25 + 20ma + 4m²a²

(a + 3x)² = a² + 6ax + 9x²

(10x + y)² = 100x² + 20xy + y²