This Quadratic Equation SAT Math Review Will be worth it

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This will review three different questions that showed up on the SAT math portion. They will all be on quadratic equations.

0:00 Problem 1 - Structure of Quadratic Equations
3:18 Problem 2 - System of Quadratic Equations
5:43 Problem 3 - Quadratic Equations Functions (Graph)
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3:10 could you explain why you add the -30 and 4 instead of dividing them like the equation seems to demand? thank you

yb