Question

If x =
3by20,
find the value of (4x - 9) x (10x + 2).​

Answer 1

$\huge\red{\underline{{\bf A}}}\huge\orange{\underline{{\bf N}}}\huge\green{\underline{{\bf S}}}\huge\blue{\underline{{\bf W}}}\huge\red{\underline{{\bf E}}}\huge\pink{\underline{{\bf R}}}{\bold\red{✓}}$

$(4x - 9)(10x + 2) \\ 40 {x}^{2} + 8x - 90x - 18 \\ 40 {x}^{2} - 82x - 18 \\ 20 {x}^{2} - 41x - 9$

Answer 2

If x= 3/20

Then, (4x - 9) x (10x + 2)

= (4*3/20 - 9) x (10*3/20 + 2)

= (3/5 - 9) x (3/2 + 2)

= (3 - 45 / 5) x (3 + 4 / 2)

= -42 x 7/2

= -147