Question

solve the equation x^2=80x+81

Answer 1

(x-40)^2-1681=0
x=40+-41

Answer 2

x^2 - 80x -81 = 0

Use the quadratic formula, also will work

Answer 3

Three ways to solve a quadratic equations:
1. Factorisation
2. Quadratic formula
3. Completing the square

Answer 4

x^2 -81x+1x-81=0
x(x-81)+1(x-81)=0
(x+1)(x-81)=0

Answer 5

bnc262, two kinds of solution have been done, so i think it is fair for you to try the last method :)

Answer 6

when my teacher did these similar problems she got 2 answers is there a reason why

Answer 7

We also got two answers if you look above. When you solve a quadratic equation expression which is equal to zero, you're actually trying to find all values of x for which that expression is equal to zero. If you look at a graph plot for the equation you're solving, you'll find that, for quadratics, the curve will cut the x-axis anywhere from zero to two times. There are, then, either zero, one or two (real) solutions for x, depending on the nature of your quadratic.

Answer 8

yes every quadratic equation have 2 answers

Answer 9

Sorry wali, have to be careful. A quadratic equation also can have just one answer or no answer.

Answer 10

o yes it con have

Answer 11

when you say solve the equation, what do you want to solve for?