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Solve the quadratic equation y=11-2x-2x^2 c)(i) x = -2.9 or 1.9 (ii) y+(3−2x−2x2)=11−2x−2x2 y=11−2x−2x2−3+2x+2x2 y=8...

Solve the quadratic equation
y=11-2x-2x^2

c)(i) x = -2.9 or 1.9

(ii) y+(3−2x−2x2)=11−2x−2x2
y=11−2x−2x2−3+2x+2x2
y=8
∴x=-1.8 or 0.8
(iii) y=11−2x−2x2
dydx=−2−4x
Gradient at x = 1 : −2−4(1)=−2−4=−6
Please my problem is(ii)
How did they get x=-1.8 and x=0.8?

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