# Find 2r^{2} + 3s^{3} - r^{2} + 4t^{2} - r^{2} if r = −2, s = −3, and t = 5.

**Solution:**

Given:

Equation is 2r^{2} + 3s^{3} - r^{2} + 4t^{2} - r^{2}

⇒ Sorting the like terms and solving,

= (2r^{2} - r^{2} - r^{2}) + 3s^{3 }+ 4t^{2}

= 3s^{3}+ 4t^{2}

**Substituting the given values of s = -3, and t = 5,**

3 (-3)^{3}+ 4 (5)^{2}

= - 81 + 100

= 19

**Hence, the required value is 19.**

## Find 2r^{2} + 3s^{3} - r^{2} + 4t^{2} - r^{2} if r = −2, s = −3, and t = 5.

**Summary: **

The value of the equation 2r^{2} + 3s^{3} - r^{2} + 4t^{2} - r^{2} if r = −2, s = −3, and t = 5 is 19.

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