What is expand (0,4a-5b)(0.4a+5b) ?

The solution to expand (0,4a-5b)(0.4a+5b) is 0,4*0.4aa+0,4*5ab-5*0.4ab-5*5bb

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expand (0,4a-5b)(0.4a+5b)

expand

(0, 4 a - 5 b) (0.4 a + 5 b)

0, 4 \cdot 0.4 aa + 0, 4 \cdot 5 ab - 5 \cdot 0.4 ab - 5 \cdot 5 bb

Solution steps

(0, 4 a - 5 b) (0.4 a + 5 b)

= (0 \cdot 4, a - 5 b) (0.4 a + 5 b)

Apply FOIL method:

(a + b) (c + d) = a c + a d + b c + b d

a = 0, 4 a, b = - 5 b, c = 0.4 a, d = 5 b

= 0, 4 a \cdot 0.4 a + 0, 4 a \cdot 5 b + (- 5 b) \cdot 0.4 a + (- 5 b) \cdot 5 b

Apply minus-plus rules

+ (- a) = - a

= 0, 4 \cdot 0.4 aa + 0, 4 \cdot 5 ab - 5 \cdot 0.4 ab - 5 \cdot 5 bb

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What is expand (0,4a-5b)(0.4a+5b) ?
The solution to expand (0,4a-5b)(0.4a+5b) is 0,4*0.4aa+0,4*5ab-5*0.4ab-5*5bb