Question

a certain number decreased by 7 multiplied by the sum of the number and 7.the product is 51.find the number.

Answer 1

(x-7)(x+7)=51
x^2-49=51
x^2=100
x=10 V x=-10

Answer 2

Yeah he is correct.

Answer 3

explain..how did you answer it all!!

Answer 4

no, u r correct.

Answer 5

Let's call the number we want to find x. Then from the text we find the equation:
(x-7)(x+7)=51
writing out the product gives:
x^2-49=51
now let's get the 49 on the other side:
x^2=100
so x=10 or x=-10.
Always be wary of the fact that quadratic equations have two solutions.

Answer 6

can you check it?

Answer 7

HE is correct.

Answer 8

I cant C a good answer here.
He owes a Medal.

Answer 9

check if its correct..

Answer 10

Medals for every1. ^.^

Answer 11

10-7=3, 10+7=17
3*17=51

for -10:
-10-7=-17, -10+7=-3
-17*-3=51

Answer 12

ok..thank you so much!!