Rewrite equation as:
y2-y-42=0
So you need two numbers that:
multiply to -42 and
add to -1
Those two numbers are: -7 and 6
so to factor you get:
(y-7)(y+6)=0
y=7 y=-6
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(3x+4)(3x-4)=0 x=±4/3
When the equation is a polynomial whose highest order (power) is 2. Eg. y= x2 + 2x + 10. Then you can use quadratic formula to solve if factoring is not possible.
To find the solution to this equation, you need to rearrange the terms and solve for the variable. 4 = 2b + b^2 can be rewritten as b^2 + 2b - 4 = 0. You can then solve this quadratic equation by factoring, completing the square, or using the quadratic formula.
Four? Factoring Graphing Quadratic Equation Completing the Square There may be more, but there's at least four.
Using the quadratic equation formula:- x = 3.795831523 or x = -5.795831523