Solve the system of equations.y=21x+44y=x2+3x+25Write the coordinates in exact form. Simplify all fractions and radicals.(______,______)(______,______)
Q. Solve the system of equations.y=21x+44y=x2+3x+25Write the coordinates in exact form. Simplify all fractions and radicals.(______,______)(______,______)
Set Equations Equal: Set the two equations equal to each other since they both equal y. This gives us 21x+44=x2+3x+25.
Rearrange and Simplify: Rearrange the equation to set it to zero by subtracting 21x+44 from both sides. This gives us x2+3x+25−21x−44=0, which simplifies to x2−18x−19=0.
Factor Quadratic Equation: Factor the quadratic equationx2−18x−19=0. This equation does not factor nicely, so we will use the quadratic formulax=2a−b±b2−4ac, where a=1, b=−18, and c=−19.
Calculate Discriminant: Calculate the discriminant Δ=b2−4ac which is Δ=(−18)2−4(1)(−19). This gives us Δ=324+76, which simplifies to Δ=400.
Use Quadratic Formula: Since the discriminant is positive, we have two real solutions. Calculate the solutions using the quadratic formula: x=218±400. This simplifies to x=218±20.
Find Values of x: Find the two values of x. The first value is x=(18+20)/2 which simplifies to x=38/2, giving us x=19. The second value is x=(18−20)/2 which simplifies to x=−2/2, giving us x=−1.
Substitute x=19: Substitute x=19 into the original equation y=21x+44 to find the corresponding y-value. This gives us y=21(19)+44, which simplifies to y=399+44, giving us y=443.
Substitute x=−1: Substitute x=−1 into the original equation y=21x+44 to find the corresponding y-value. This gives us y=21(−1)+44, which simplifies to y=−21+44, giving us y=23.
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