Q. −21(t−3)+t2=0How many distinct real solutions does the given equation have?Choose 1 answer:(A) 0(B) 1(C) 2(D) 4
Write equation: Write down the given equation.The equation is: −21(t−3)+t2=0
Multiply by −2: Multiply both sides of the equation by −2 to get rid of the fraction.−2⋅[−21(t−3)+t2]=−2⋅0This simplifies to: (t−3)−2t2=0
Rearrange to quadratic form: Rearrange the equation to standard quadratic form. −2t2+t−3=0
Use discriminant: Use the discriminant to determine the number of real solutions.The discriminant of a quadratic equationax2+bx+c is b2−4ac.For the equation −2t2+t−3, a=−2, b=1, and c=−3.Discriminant = b2−4ac=(1)2−4(−2)(−3)=1−24=−23
Interpret discriminant: Interpret the discriminant.Since the discriminant is negative −23, there are no real solutions to the equation.