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# PLS HELP ASAP

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1. An algebraic expression of the form a + bx has the value of 15 when x = 2 and the value of 3 when x = 5. Calculate a + b.

2. compute $$123456789^2 - 2\cdot123456789\cdot 123456787 + 123456787^2$$

3. Let $$r$$ and $$s$$ be the roots of $$3x^2 + 4x + 12 = 0$$ . Find $$r^2 + s^2.$$

Jun 5, 2020