Solving quadratics by competeimg the square

[mellow nimbus]

so you know that the completed square form will defo have (x+5)^2

because of the x^2 + 10x right

now if you expand the (x+5)^2

that gives you x^2 + 10x + 25

but we want the last term to be -3 not 25

[mellow nimbus]

so subtract 28 from this
x^2 + 10x + 25 - 28

(x+5)^2 - 28

@obsidian hazel