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Answer:
[tex]x^2+4x-45[/tex]
Step-by-step explanation:
Multiplying x * x gives us [tex]x^2[/tex]
then multiplying x * -5 gives us -5x
then multiplying 9 * x gives us 9x
then multiplying 9 * -5 = -45
Now write this as one big equation:
[tex]x^2-5x+9x-45[/tex]
Combine like terms and you get [tex]x^2+4x-45[/tex]