Help pls ill give branilyest

3 ( 7 + 5 ) and 21 + 15

10 ( 4 + 9 ) and 40 + 90

7 ( 3 + 5 ) and 21 + 35

4 ( 10 + 9 ) and 40 + 36

Step-by-step explanation:

You can use the distibutive property to figure this out:

3 ( 7 + 5 )

( 3 x 7 ) + ( 3 x 5 )

21 + 15

10 ( 4 + 9 )

( 10 x 4 ) + ( 10 x 9 )

40 + 90

7 ( 3 + 5 )

( 7 x 3 ) + ( 7 x 5 )

21 + 35

4 ( 10 + 9)

( 4 x 10 ) + ( 4 x 9 )

40 + 36

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step-by-step explanation:

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.