Trying to find the right answer to this..

The given quadratic equation is 2x 2 + 5x – 3 = 0 Putting a = – 3, we get L.H.S. = 2x 2 + 5x – 3 = 2 (–3) 2 + 5 (– 3) – 3 = 2 x 9 – 15 – 3 = 18 – 15 – 3 = 15 – 15 = 0 = R.H.S. Hence, x = – 3 is a solution of 2x 2 + 5x – 3 = 0 Proved.

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Quadratic Equations

Short Answer Type

81. Show that x = – 3 is a solution of 2x² + 5x – 3 = 0.

The given quadratic equation is
2x² + 5x – 3 = 0 Putting a = – 3, we get
L.H.S. = 2x² + 5x – 3
= 2 (–3)² + 5 (– 3) – 3
= 2 x 9 – 15 – 3
= 18 – 15 – 3 = 15 – 15 = 0 = R.H.S.
Hence, x = – 3 is a solution of 2x² + 5x – 3 = 0 Proved.

91 Views