Mathayom 3 Test.

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Presentation transcript:

Mathayom 3 Test

Radical Equation Solve for the value of the unknown. 9𝑥+4 − 𝑥+9 =3 9𝑥+4 − 𝑥+9 =3 𝑥 −15 + 𝑥 =3 7𝑥+4 =7 3𝑥 2 +10𝑥 −5=0 3𝑥 −5 + 𝑥 −1 =2

Factoring by Difference of Two Squares 27 − 𝑥 −2 2 (5𝑥 −1) 2 −48 25 9 𝑥 2 −32 27𝑥 2 −48𝑥 2𝑥 2 𝑦 − 32𝑦 3

Two circles, A and B, have areas 243∏ and 192 ∏ 𝑚 2 respectively Two circles, A and B, have areas 243∏ and 192 ∏ 𝑚 2 respectively. What is the difference between the radii of these two circles? Let ∆HIJ be a right triangle with equilateral legs. If its hypotenuse is 16 2 𝑖𝑛, find the measures of its legs. Find the perimeter of a square if its diagonal is 18 2 . The average profit of a company (in millions per month) from 2001 to 2008 can be modeled by the equation 𝑦=4.5 1.2𝑥+1.05 , where x is the number of years since 2000. In what year will the profit of the company by 12 million?