z^2+9=10z I rewrote it as z^2-10z+9=0 but I don't understand what to do next
can anyone please help me?????? thanks for nothing folks

Question

z^2+9=10z   I rewrote it as z^2-10z+9=0  but I don't understand what to do next
can anyone please help me?????? thanks for nothing folks

ajprincess · Answer

What do u get when u multiply 16 by 81 @leslieJampolsky?

anonymous · Answer

1296

ajprincess · Answer

Can u tell me two factors of 1296 such that their sum is 72?

anonymous · Answer

36X36=1296  and 36+36=72

ajprincess · Answer

yup u r right:)

anonymous · Answer

I got to : 16x+36x+36x+81 but I don't know what to do next

ajprincess · Answer

Try to factorise 16x^2+36x and 36x+81.
What do u get when u factorise them @leslieJampolsky?

anonymous · Answer

4x(4x+9) +9(4x+9)

anonymous · Answer

4x(4x+9)1(36+81)   but I think that is wrong

anonymous · Answer

to uzumakhi: so to simplify even more would it read: x(4x+9)(4x+9)????

anonymous · Answer

no its (4x+9)^2

ajprincess · Answer

16x^2+36x=4x(4x+9)
36x+81=9(4x+9)
16x^2+36x+36x+81=4x(4x+9)+9(4x+9)
                                 =(4x+9)(4x+9)
                                 =(4x+9)^2
Getting this @leslieJampolsky?

anonymous · Answer

Notice how $4x\cdot4x = 16x^2$ and $9\cdot9 = 81$ and  $2(9+4x) = 72x$

anonymous · Answer

thank you all so much

ajprincess · Answer

yw:)