Question

(i) Will the value of 2X² + 12X + 3 for X=-4 be greater than 15?

(ii) If X² is added to 2X² + 12X + 3 and 15 is subtracted from it then evaluate its value at X= -4?​

Answer 1

(i) Value of the expression for X= -4

2X² + 12X + 3

2 (-4)² + 12 (-4) + 3

2 (16) - 48 + 3

32 - 48 + 3= -15

Hence, the value of expression 2X² + 12X + 3 at X= -4 is lesser than 15.

(ii) As per question

X² is added to 2X² + 12X + 3 and 15 is subtracted from it.

So, the final expression is:

2X² + 12X + 3 + X² - 15

3X² + 12X - 12

On putting X= -4 in the above equation we get:

3 × (-4)² + 12 × (-4) - 12

= 48 - 48 -12

= -12

Answer 2

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ⒽⒺⓇⒺ ⒾⓈ ⓎⓄⓊⓇ ⒶⓃⓈⓌⒺⓇ

ⓆⓊⒺⓈⓉⒾⓄⓃ:

(i) Will the value of 2X² + 12X + 3 for X=-4 be greater than 15?

ⓈⓄⓁⓊⓉⒾⓄⓃ:--

Value of the expression for X= -4

2X² + 12X + 3

2 (-4)² + 12 (-4) + 3

2 (16) - 48 + 3

32 - 48 + 3 = -15

Hence,

The value of expression 2X² + 12X + 3 at X = -4 is lesser than 15.

ⓆⓊⒺⓈⓉⒾⓄⓃ:

(ii) If X² is added to 2X² + 12X + 3 and 15 is subtracted from it then evaluate its value at X= -4?

ⓈⓄⓁⓊⓉⒾⓄⓃ:--

As per question

X² is added to 2X² + 12X + 3 and 14 is subtracted from it.

So, the final expression is:

2X² + 12X + 3 + X² - 15

3X² + 12X - 13

On putting X= -4 in the above equation we get:

3 × (-4)² + 12 × (-4) - 12

= 48 - 48 - 12

= -12

ⒽⓄⓅⒺ ⒾⓉ ⒽⒺⓁⓅⓈ

ⒻⓄⓁⓁⓄⓌ Ⓜ️Ⓔ