Question

step by step explanation please ​

Answer 1

Answer:

1.(2a+3)×(2a-3)×(4a²+a)

= 2a×2a+a+3-3×4a²

= 4a²+a×4a²

= 16a(raised to 4)+a

2.(5x+8y)×(5x-8y)

= 5x×5x+8y-8y

= 25x²

3.(4.6)×(5.4)

= 46/10×54/10

= 2484/100

= 621/25

4.(0.5-2a)×(0.5+2a)

= 0.5×0.5-2a+2a

= 0.25

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