# math

posted by .

factor the expression:
10a^2-19a+7

ok I no how to start of which would be
(10a- )(a+ )
but i don't no how to factor it from here

• math -

If you are in a class-room situation, then you should have been taught some kind of "method" to do these, just plain guessing works only up to a point.

there are actually two choices for the first terms
(10x..)(x...) or (5x....)(2x....)

at the back it would have to be
(..-7)(...-1) or (...+7)(...+1)

remember, after you make your choice, expand to see if you get the original.

• math -

ok i get it now i just didn't no what to do with the middle number

## Similar Questions

1. ### algebra 1

Can someone solve theses for me? Factor the polynomial x2 + 7x + 12 completely Factor the polynomial x2 – 4 completely Factor the polynomial 18a2b – 4ab + 10a completely x2 + 7x + 12 = (x+4)(x+3) x2 – 4 = (x+2)(x-2) 18a2b –
2. ### Algebra

Factor. 3a^2 - 10a + 8 Thank you! :-)
3. ### math

Simplify and show: 2a-6(10a)-5a^2(2) ----------------- (2a-6)^2 This is my work but its not right. 10a-10a^2 -------- 2a-6 Then solve for a by setting numerator to zero. so I got this... 10a-10a^2=0 10a(1-a)=0 a=0, a=1 My book says …
4. ### help!

factor a - 10a + 21
5. ### math

10a^2 + 25a - 15 factor out the GCF.
6. ### math

What is the simplest form of the expression below?
7. ### Geometry

Solve 10a - 5b = 25 for b. f) b = 10a + 25 g) b = 10a - 25 h) b = 2a +5 i) b = 2a - 5 What exactly are they asking me to do here?
8. ### Geometry

Solve 10a - 5b = 25 for b. f) b = 10a + 25 g) b = 10a - 25 h) b = 2a +5 i) b = 2a - 5 What exactly are they asking me to do here?
9. ### Algebra

factor a^2+10a+24 t^2+4t-45