Question

Упростити выражение (2а-3b)(7a+4b)-(3,5a+b)(4a-6b)

Answer 1

$(2a-3b)(7a+4b)-(3.5a+b)(4a-6b)=\\ =[(2a-3b)(7a+4b)]-[(3.5a+b)(4a-6b)]=\\ =[2a*(7a+4b)-3b*(7a+4b)]-[3.5a*(4a-6b)+b*(4a-6b)]=\\ =[2a*7a+2a*4b-3b*7a-3b*4b]-\\ -[3.5a*4a-3.5a*6b+b*4a-b*6b]=\\ =[14a^2+8ab-21ab-12b^2]-[14a^2-21ab+4ab-6b^2]=\\ =14a^2+8ab-21ab-12b^2-14a^2+21ab-4ab+6b^2=\\ =8ab-12b^2-4ab+6b^2=4ab-6b^2$

Answer 2

I can help you with math problems. To simplify the expression, you need to apply the distributive property and combine the like terms. Here are the steps:

- $(2a-3b)(7a+4b) - (3.5a+b)(4a-6b)$ - $= 14a^2 + 8ab - 21ab - 12b^2 - 14a^2 + 21ab - 4ab + 6b^2$ - $= -10ab - 6b^2$

The simplified expression is $-10ab - 6b^2$.Ответь+подробно.+Упростити+выражение+(2а-3b)(7a+4b)-(3,5a+b)(4a-6b)