Question

what is the factor 28y-4msqr+3cube

Answer 1

Answer:

At first we Can factor

4

(

2

y

2

−

7

y

−

15

)

since

8

=

2

⋅

4

28

=

7

⋅

4

and

60

=

15

⋅

4

so we get

4

(

2

y

2

−

7

y

−

15

)

now we solve the equation

2

y

2

−

7

y

−

15

=

0

dividing by

2

y

2

−

7

2

y

−

15

2

=

0

by the quadratic formula we get

y

1

,

2

=

7

4

±

√

49

16

+

120

16

y

1

,

2

=

7

4

±

√

169

16

so we get

y

1

,

2

=

7

4

±

13

4

this gives

y

1

=

5

y

2

=

6

4

=

3

2

so we get

4

(

y

−

5

)

(

2

y

+

3

)