Question

Solve the quadratic equation.

3x^2 - 5= 70

(Please explain steps)

Answer 1

1.Change the minus sign into a positive
2.add five to both sides
3.do 3 to the 2nd power
4. Divide the two numbers (the one with the variable and the number u got when u added five to it)

Answer 2

Simplifying
3x2 + -5 = 70

Reorder the terms:
-5 + 3x2 = 70
Solving
-5 + 3x2 = 70

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '5' to each side of the equation.
-5 + 5 + 3x2 = 70 + 5

Combine like terms: -5 + 5 = 0
0 + 3x2 = 70 + 5
3x2 = 70 + 5

Combine like terms: 70 + 5 = 75
3x2 = 75

Divide each side by '3'.
x2 = 25

Simplifying
x2 = 25

Take the square root of each side:
x = {-5, 5} and that’s it.