Question

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Answer 1

Answer:

The value of x for given expression is x = ± 2. 23   and   - 1 .33

Step-by-step explanation:

Given expression as :

3x³ + 4x² - 15x - 20 = 0

Or, 3x³ - 15x + 4x² - 20 = 0

Or, 3x (x² - 5) + 4 (x² - 5 ) = 0

Or,  (x² - 5 ) (3x + 4) = 0

Or, (x² - 5)  = 0      And   (3x + 4) = 0

∴  x = ±√5 = ± 2.23     And     x = $\frac{-4}{3}$ = - 1.33

Hence the value of x for given expression is x = ± 2. 23   and   - 1 .33 Answer

Answer 2

Answer:

235

Step-by-step explanation:

3x3=9

4x2=8

8+9=17

17 x15=225

225 - 20=235