2022 AIME I Problem 1

Below is the professionally curated solution for Problem 1 of the 2022 AIME I, from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2022 AIME I solutions, or check the answer key.

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Concepts:polynomiallinear equation

Difficulty rating: 1890

1.

Quadratic polynomials P(x)P(x) and Q(x)Q(x) have leading coefficients of 22 and 2,-2, respectively. The graphs of both polynomials pass through the two points (16,54)(16, 54) and (20,53).(20, 53). Find P(0)+Q(0).P(0) + Q(0).

Solution:

Let R(x)=P(x)+Q(x).R(x) = P(x) + Q(x). The leading coefficients 22 and 2-2 cancel, so RR is a linear function. Since both graphs pass through (16,54)(16, 54) and (20,53),(20, 53), we get R(16)=108R(16) = 108 and R(20)=106.R(20) = 106.

The slope of RR is 1061082016=12,\frac{106 - 108}{20 - 16} = -\frac{1}{2}, so P(0)+Q(0)=R(0)=R(16)+1612=108+8=116.P(0) + Q(0) = R(0) = R(16) + 16 \cdot \frac{1}{2} = 108 + 8 = 116.

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