a) \( y^{2}-y-30 \)
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Bonus Knowledge
To factor the quadratic expression \( y^2 - y - 30 \), we look for two numbers that multiply to \(-30\) and add to \(-1\). Those numbers are \(5\) and \(-6\). Thus, we can write the expression as \((y - 6)(y + 5)\). This means the solutions to \( y^2 - y - 30 = 0 \) are \( y = 6 \) and \( y = -5 \). If you want to solve quadratics effortlessly, always remember the “AC method” where you multiply \(a\) and \(c\) in \(ax^2 + bx + c\) to find two numbers whose product is \(ac\) and sum is \(b\). It's a neat trick that can save you time on tests and homework!
