Question

Multiply.
(5x)(3x)(6x2 – 1)

Answer 1

\[15x ^{2}(6x ^{2}-1)\]

Answer 2

then would it be 90x^4-15x^2 ?

Answer 3

Yeah but you have to simplify.

Answer 4

(5x)(3x)(6x^2 – 1)
1. work the brackets first

5x * 3x = 15x^2

2. Multiply the above into the left brackets:
15x^2 ( 6x^2 -1)
= 15x^2*6x^2 - 15x^2*1
= 90x^4 - 15x^2

Answer 5

Use BODMAS:
B Rackets first
O OF ( if there is of)
D Division ( if there is division)
M Multiplication ( if multiplication exists)
A Additition ( if there is addition)
S Subtraction ( if there is subtraction)

Answer 6

First, multiply 3x and 5x which is 15x^2 . Then you go ahead and multiply 15x^2 into the (6x^2 -1) which would equal 90x^4 - 15x^2, but usually they make you simplify so you get the GCF (15x^2) and factor it out to simplify.