Sep 19, 2017 · The answer is 13. Method 1: Plot graph of [math]a + b = 7 [/math]which is a straight line intersecting a and b axis (rectangular coordinate ...

Apr 14, 2024 · a+b = 7. ab = 12. Those are 2 equations with 2 unknowns. Extracting “b = 7–a” in the first equation and substituting it in the second one:.

Apr 14, 2024 · => (a - b) = 1 or -1. Therefore,. a² - a b - b² = (a - b)(a + b) - a b = (+1)(7 ...

May 27, 2022 · 3 × 4 = 12; 3 + 4 = 7; so a = 3 & b = 4, or a = 4 & b = 3. Addition & multiplication are both commutative, so the 2 variables can swap values ...

Apr 15, 2024 · (a+b)² = 49 a² + 2ab + b² = 49 a² + b² = 25 1. a = 4 → b = 3 a² - ab - b² = 16 - 12 - 9 = -5 2. a = 3 → b = 4 a² - ab - b² = 9 - 12 - 16 = -19.

Aug 25, 2020 · Presumably the question should read: If a + b + c = 7 and ab + bc + ca = 12, then what is the value of a^2 + b^2 + c^2.

Aug 6, 2018 · This means a^2 and b^2 end in 4 and 9. That is, a and b end in 2,8 and 3,7. Thankfully, 613 is a small number: so, not ...

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Sep 16, 2022 · Here's the simplest solution : Here I have just used simple elimination method by adding the two equations to get value of a, then by putting ...

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