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Official 2021 Paper 1 · Q8

Paper 1Algebra

The line y=2x+3y=2x+3 meets the curve y=x2+bx+cy=x^2+bx+c at exactly one point.

The line y=4x−2y=4x-2 also meets the curve y=x2+bx+cy=x^2+bx+c at exactly one point.

What is the value of b−cb-c?

A−9-9
B−5.5-5.5
C−1-1
D55
E66
F1414

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