I keep getting the wrong answers >:'D (F.O.I.L.)

Question A

(3x+5z)(7x-2z)

Question B

(5y-4z)(6y-7z)

Question C

(3y+2)(5y-8)

Question D

(5c-4d)(c+8d)

I have a couple more but I don't want to overwhelm anyone. I just can't get these right.

Like 8

The answers and steps

[3x+5z][7x-2z]

[3x•7x]-[3x•2z]+[5z•7x]-[5z•2z]

That can be made into 21x^2-6xz+35xz-10z^2

Which can be further simplified to

21x^2+33xz-10z^2

[5y-4z][6y-7z]

[5y•6y]-[5y•7z]-[4z•6y]+[4z•7z]

This turns to

30y^2-35yz-24yz+28z^2

This is simplified to

30y^2-59yz+28z^2

1 Reply 04/15/20

Ah, multiplying binomials

1 Reply 04/15/20

maths_geek

Could you maybe send a picture of what you did so that we can point out the wrong step(s)

0 Reply 04/14/20