Q. Solve the equation for all real solutions in simplest form.−3r2−r−10=−4r2
Move r2 terms: Add 4r2 to both sides of the equation to move all the r2 terms to one side.−3r2−r−10+4r2=−4r2+4r2This simplifies to r2−r−10=0.
Factor quadratic equation: Factor the quadratic equationr2−r−10. We look for two numbers that multiply to −10 and add to −1. These numbers are −5 and 2. So, the factored form is (r−5)(r+2)=0.
Solve for r: Set each factor equal to zero and solve for r.First, set r−5=0, which gives r=5.Second, set r+2=0, which gives r=−2.
More problems from Simplify expressions using trigonometric identities