Q. Complete the square to re-write the quadratic function in vertex form:y=x2+3x−5Answer: y=
Focus on x2 and x terms: To complete the square and rewrite the quadratic function in vertex form, we first need to focus on the x2 and x terms. The vertex form of a quadratic function is y=a(x−h)2+k, where (h,k) is the vertex of the parabola. We will complete the square for the x2+3x part of the function.
Complete the square: The coefficient of x2 is 1, which is already in the form we need. To complete the square, we take the coefficient of x, which is 3, divide it by 2, and square the result to find the constant term that will complete the square.(23)2=2.25 or 49.
Rewrite the equation: We add and subtract this constant term 49 inside the parentheses to maintain the equality of the equation.y=x2+3x+49−49−5
Factor the perfect square trinomial: Now we can rewrite the equation by grouping the perfect square trinomial and combining the constants outside the parentheses.y=(x2+3x+49)−49−5
Combine the constants: The perfect square trinomial x2+3x+49 can be factored into (x+23)2.y = (x+23)2−49−5
Final vertex form: Next, we need to combine the constants. To combine −49 and −5, we need a common denominator. Since 5 is the same as 420, we rewrite −5 as −420.y=(x+23)2−49−420
Final vertex form: Next, we need to combine the constants. To combine −49 and −5, we need a common denominator. Since 5 is the same as 420, we rewrite −5 as −420. y=(x+23)2−49−420Now we combine the constants −49 and −420 to get −429. −50
Final vertex form: Next, we need to combine the constants. To combine −49 and −5, we need a common denominator. Since 5 is the same as 420, we rewrite −5 as −420. y=(x+23)2−49−420Now we combine the constants −49 and −420 to get −429. −50The quadratic function is now written in vertex form, which is −51, where −52 is the vertex of the parabola. In this case, the vertex form of the function is: −50
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