2018年3月20日 · (x-3)(x+3) >x^2-9" is a "color(blue)"difference of squares" "and in general factorises as" •color(white)(x)a^2-b^2=(a-b)(a+b) "here "a=x" and "b=3 rArrx^2-9=(x-3)(x+3)

2016年11月1日 · x = +3, x = -3 In x^2 =9 , you need to get rid of the power of 2 in order to isolate just x This involves finding the square root. sqrtx^2 = x However there are 2 possible answers to a square root, a positive or a negative answer. x = +-sqrt9 x = +-3

2015年6月28日 · x^2+9 has no (Real) factors (Unlike x^2-9) The most you could do with this is use the quadratic formula on ...

2016年7月19日 · How do I use the quadratic formula to solve #f(x) = 4x^2 + 12x + 9#? How do I use the quadratic formula to solve #f(x) = x^2 + 3x - 7#? What is the discriminant of a quadratic function?

2018年7月27日 · #y=0^2-9# #y=-9# The vertex is #(0,-9)# Plot this point. In this case, the vertex is also the y-intercept, which is the value of #y# when #x=0#. X-intercepts: values for #x# when #y=0# Substitute #0# for #y# and solve for #x#. #0=x^2-9# Switch sides. #x^2-9=0# Factor #x^-9# #(x+3)(x-3)=0# Set each binomial equal to #0# and solve. #x+3=0# #x=-3#

\[{x}^{2}-9\] +. > < ...

The solutions are S={-3,3} The equation is |x^2-9|=x^2-9 Therefore, {(x^2-9=x^2-9),(x^2-9=-x^2+9):} <=>, {(O/),(2x^2-18=0):} <=>, {(O/),(x^2-9 =0):} <=>, {(O/),((x+3 ...

Factor x^2-9 - Answer | Math Problem Solver - Cymath ... \\"Get

2017年7月30日 · Therefore, y=sqrt(x^2-9) rarr x^2-9>=0 Now, we set it equal to 0 x^2-9=0 x^2=9 x=-3, x=3 Now we have these points. Let us call them boundary points of the real number line. So we have 3 intervals - (-oo,-3), (-3,3), and (3,oo) Just choose a point in each interval and substitute it into the original equation (x^2-9>=0)to check if it is valid or ...

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