Question

(ii) (3x2 + 5x – 7) (x + 5y)
plz solve it ​

Answer 1

Answer:

(3x^2+ 5x-7)(x+5y)

using binomial multiplying property

x( 3x^2+ 5x-7)+ 5y(3x^2+ 5x-7)

3x^3 + 10x- 7x+ 15x^2+ 10xy- 35y

3x^3 - 3x+ 15x^2 + 10xy - 35y

rearranging in like terms

3x^3+ 15x^2 - 3x-35y+ 10xy

Answer 2

(3x²+5x-7)(x+5y)

by commutative property of multiplication we can interchange the brackets

(x+5y)(3x²+5x-7)

=x(3x²+5x-7)+5y(3x²+5x-7)

=3x³+5x²-7x+15x²y+25xy-35y

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